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<body style="clear:both; padding-left:10px; padding-top:5px; padding-right:5px; padding-bottom:5px"><a name="EN-US_TOPIC_0000001251316909"></a><a name="EN-US_TOPIC_0000001251316909"></a>

<h1 class="topictitle1">Fan and Heat Dissipation</h1>
<div><div class="section" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_section115911712181411"><h4 class="sectiontitle">Function Description</h4><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p38777358395">On the <span class="wintitle" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0232503605_en-us_topic_0160738180_wintitle112440201013"><b>Fan and Heat Dissipation</b></span> page, you can:</p>
<ul id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_ul642914711525">
  
  <li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li3301183816372">View and configure the fan adjustment settings.<div class="note" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_note1391155745511"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p127333314211">If the fan adjustment mode is <span class="uicontrol" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0232503605_en-us_topic_0160738180_uicontrol71961015191110"><b>Manual</b></span>, all the settings on the <span class="uicontrol" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0232503605_en-us_topic_0160738180_uicontrol1534112791114"><b>Smart Cooling</b></span> page will take effect only when the fan adjustment mode changes to <span class="uicontrol" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0232503605_en-us_topic_0160738180_uicontrol2185345161115"><b>Auto</b></span>.</p>
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</li></ul>
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<ul id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_ul175231045115415"><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li176253463618">View information about the fans installed in the server.</li>
 </ul>
<div class="note" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_note34074491417"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p1540744121411">The display of the fan and heat dissipation interface varies according to the configuration. The actual display on the WebUI prevails.</p>
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<div class="section" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_section1815520717179"><h4 class="sectiontitle">Parameter Description</h4>


<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_table1950162320436" frame="border" border="1" rules="all"><caption><b>Table 1 </b>Fan information</caption><thead align="left"><tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_row142317113115"><th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.4.3.2.3.1.1"><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p1423110111512">Parameter</p>
</th>
<th align="left" class="cellrowborder" valign="top" width="75%" id="mcps1.3.4.3.2.3.1.2"><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p42465111110">Description</p>
</th>
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<tbody><tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_row42461011819"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.4.3.2.3.1.1 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p82461111912">Basic information</p>
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<td class="cellrowborder" valign="top" width="75%" headers="mcps1.3.4.3.2.3.1.2 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p132465117115">Basic information about the fan modules of the server, including the slot number, name, model, speed, expected speed ratio, speed ratio and part number of each fan module.</p>
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<tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_row117191440476"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.4.3.2.3.1.1 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p16720124020715">Real-Time Refresh</p>
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<td class="cellrowborder" valign="top" width="75%" headers="mcps1.3.4.3.2.3.1.2 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p1184293211108">Enables or disables the real-time refreshing of fan information.</p>
<p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p18235145935012">Once enabled, the fan speed and speed ratio are automatically refreshed every second.</p>
<p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p182351959125011">It is disabled by default.</p>
<div class="note" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_note14174113592015"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p1174153519201">If you refresh the current page, switch to another page, or close the page after the <span class="uicontrol" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_uicontrol715453564213"><b>Real-Time Refresh</b></span> function is enabled, this function will be automatically disabled.</p>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_table828217604514" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Fan Settings</caption><thead align="left"><tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_row122914911197"><th align="left" class="cellrowborder" valign="top" width="25%" id="mcps1.3.4.4.2.3.1.1"><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p729798196">Parameter</p>
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<th align="left" class="cellrowborder" valign="top" width="75%" id="mcps1.3.4.4.2.3.1.2"><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p9292921916">Description</p>
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<tbody><tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_row16273112643512"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.4.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p0181102102917">Fan Running Mode</p>
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<td class="cellrowborder" valign="top" width="75%" headers="mcps1.3.4.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p370151715220">Specifies the fan running mode.</p>
<ul id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_ul137071713221"><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li170101719225"><strong id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_b19701317112211">Automatic</strong>: The server automatically sets the fan speed ratio based on the current environment.</li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li07021732215"><strong id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_b107010173224">Manual</strong>: The expected fan speed ratio is manually set.</li></ul>
<p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p370141702215">Default value: <strong id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_b97051715224">Automatic</strong></p>
<div class="note" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_note073822812218"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_ul12323153415229"><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li1549944732216">You can set the expected speed ratio for all fans or a single fan only in the Manual mode.</li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li1632310341226">In the Manual mode, the fan speed adjustment mode set does not take effect.</li></ul>
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<tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_row1793072213356"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.4.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p239320951111">Fan</p>
</td>
<td class="cellrowborder" valign="top" width="75%" headers="mcps1.3.4.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p7433997237">Selects the fan for which the expected speed ratio is set in the Manual mode.</p>
<p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p2043314962313">Default value: <strong id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_b1433099231">Global</strong></p>
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<tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_row182132043514"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.4.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p13951427131115">Expected Speed Ratio</p>
</td>
<td class="cellrowborder" valign="top" width="75%" headers="mcps1.3.4.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p1991512124012">Set the PWM duty cycle of the current fan in manual mode.</p>
<div class="note" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_note655612194402"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p32191426194018">The PWM duty cycle of the fan is in a non-linear relationship with the fan speed reported by the hardware. As a result, the expected speed may be different from the actual one.</p>
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<tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_row182132043514"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.4.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p13951427131115">Fan Speed Difference Alarm Threshold</p>
</td>
<td class="cellrowborder" valign="top" width="75%" headers="mcps1.3.4.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p1991512124012">The maximum percentage difference between the actual and expected fan speed that does not trigger an alarm.</p>
<p>Value range: 10-100, with 100 indicating alarm disabled.</p>
<p>Default value: <strong>25</strong>.</p>
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<tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_row203010913196"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.4.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p1530159101916">Energy saving mode</p>
</td>
<td class="cellrowborder" valign="top" width="75%" headers="mcps1.3.4.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p16281732596">It is the default mode for the air cooled system.</p>
<p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p1930179171912">Adjusts fans to the system load for better heat dissipation and power savings.</p>
</td>
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<tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_row1930129151919"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.4.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p16301971911">Low noise mode</p>
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<td class="cellrowborder" valign="top" width="75%" headers="mcps1.3.4.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p143012912196">Minimizes fan speed to dissipate heat quietly.</p>
</td>
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<tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_row143010919194"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.4.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p43089151917">High performance mode</p>
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<td class="cellrowborder" valign="top" width="75%" headers="mcps1.3.4.4.2.3.1.2 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738175_p43017913192">Maximizes fan speed for optimal component cooling and system running.</p>
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<tr id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_row172776981018"><td class="cellrowborder" valign="top" width="25%" headers="mcps1.3.4.4.2.3.1.1 "><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p195491952180">Custom mode</p>
</td>
<td class="cellrowborder" valign="top" width="75%" headers="mcps1.3.4.4.2.3.1.2 "><div class="p" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p50314181013">Provides interfaces for users to customize the following parameters. Optional value ranges will be given as references based on the server load and heat dissipation situation.<ul id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_ul13017915192"><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li176521638121910">CPU Target Temperature</li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li1466014512195">Air Outlet Target Temperature</li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li1793155017192">Fan Speed</li></ul>
<div class="note" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_note151814101019"><span class="notetitle"> NOTE: </span><div class="notebody"><ul id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_ul1911614111012"><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li662961510197">The fan speed corresponding to a higher temperature range must be greater than the fan speed corresponding to a lower temperature range.</li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li311114121013">The parameters available in the custom mode vary depending on the server model.</li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li0816154616">If any actual temperature is higher than the target temperature of the fan speed adjustment, the <span id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_ph1513134579">BMC</span> increases the fan speed to lower the temperature. If all the actual temperatures are lower than the target temperature of the fan speed adjustment, the <span id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_ph1161231619575">BMC</span> adjusts the fan speed based on the <strong id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_b670032216287">Fan Speed</strong> value.</li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li91614191016">During CPU replacement, if the highest operating temperature of the new CPU is lower than the current value of <span class="uicontrol" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_uicontrol850919225611"><b>CPU Target Temperature</b></span>, the <span id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0269442969_ph1970530225">BMC</span> automatically changes the value of <span class="uicontrol" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_uicontrol1121413420617"><b>CPU Target Temperature</b></span> to the maximum temperature allowed by the new CPU.</li></ul>
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<div class="section" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_section78714233412"><h4 class="sectiontitle">Setting the Speed Adjustment Mode</h4><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_p8308192411163"></p>
<div class="p" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738246_p1911312820396">For example, to set the smart cooling mode to <span class="uicontrol" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_uicontrol2052211261104"><b>Custom mode</b></span>, perform the following steps:<div class="note" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738246_note681311321293"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738246_p1981311321297">If the custom mode is not set properly, insufficient heat dissipation may be caused.</p>
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<ol id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738246_ol1637019338411"><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li440710383458"><strong>Optional: </strong><span>On the <strong id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_b1817157241">Fan Settings</strong> tab page, set <strong id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_b98491917264">Fan Running Mode</strong> to <strong id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_b1589174822418">Automatic</strong>.</span></li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738246_li10371103314117"><span>Select <span class="uicontrol" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_uicontrol22581352300"><b>Custom mode</b></span>.</span></li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li1457218315147"><span>Set <span class="uicontrol" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_uicontrol104568152128"><b>CPU Target Temperature</b></span> based on the value range displayed.</span></li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_li106308262045"><span>Set the fan speeds corresponding to the inlet temperature ranges.</span></li><li id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738246_li937118331414"><span>Click <span class="uicontrol" id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_uicontrol115514174118"><b>Save</b></span>.</span><p><p id="EN-US_TOPIC_0000001251316909__en-us_topic_0000001251228909_en-us_topic_0160738246_p202983620419">If "Operation successful" is displayed, the smart cooling mode is set successfully.</p>
</p></li></ol>
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